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Outside of the diesel realm and more in line with the SBC route, an LQ4 is a great modern motor. It's an iron block truck version of a gen III ls2 motor. Being the "less" desirable iron block they're available pretty cheap. 300-325 HP stock and a perfect match to a 4l80E.

A 4-53 or a 4-53T Detroit will fit reasonably well, be similar in performance to the 6.2, and they make a wonderful racket. They are very hard to kill and very simple to wrench on. They'll be around at the end of time with cockroaches, twinkies, and Cher. A 6v-53 would fit and make more...